Several thousand German heating contractors participated in a survey that is conducted every two years in the run-up to the ISH trade fair by the industry service 'markt intern'. Manufacturers' performance was assessed in various product and service categories. Thanks to a total of two top places, one second place and one third place, the overall victory, and receipt of the “Golden Partnership Certificate” once again went to Viessmann.

Hans Georg Pauli, of markt intern, said: 'It is a fantastic achievement that the entire Viessmann team achieves year after year. Taking the top spot is one thing, but defending it 15 times is quite another. Viessmann is fortunate not only to have installers, but also real fans. This is also due to the fact that weaknesses, which can be found from time to time in the performance chart, are analysed and remedied. Listening to installers and responding to their wishes is one of Viessmann's strengths – and this has been evident in the 'mi' performance review for over 30 years. Congratulations on the 16th overall victory in a row as no. 1 trade partner.'

Max Viessmann, co-chief executive of Viessmann, said: 'Receiving the award once again is a strong vote of confidence from our installers who always support us in the development of our solutions in the true spirit of 'Co-Create Climate for Life'. But I would also like to thank all the Viessmann family members, whose great expertise and extraordinary commitment have made this success possible.”

Viessmann also won first place in product awards for condensing boilers and biomass, second place for boilers and third place for heat pumps. The awards were presented at Viessmann Live, an online event in place of a conventional show stand at the ISH trade fair.